US10266525B2 - Processes for preparing 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole - Google Patents

Processes for preparing 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole Download PDF

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US10266525B2
US10266525B2 US15/578,258 US201615578258A US10266525B2 US 10266525 B2 US10266525 B2 US 10266525B2 US 201615578258 A US201615578258 A US 201615578258A US 10266525 B2 US10266525 B2 US 10266525B2
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formula
compound
salt
give
pyran
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Robert Nicholas BREAM
John David Hayler
Alan Geoffrey IRONMONGER
Peter Szeto
Michael Robert WEBB
Katherine Marie Penelope WHEELHOUSE
Robert David Willacy
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GlaxoSmithKline Intellectual Property Development Ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing three or more hetero rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/415—1,2-Diazoles
    • A61K31/416—1,2-Diazoles condensed with carbocyclic ring systems, e.g. indazole
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/42—Oxazoles
    • A61K31/422—Oxazoles not condensed and containing further heterocyclic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
    • C07D263/02—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings
    • C07D263/30—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D263/32—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic System
    • C07F5/02—Boron compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
    • C07B2200/00—Indexing scheme relating to specific properties of organic compounds
    • C07B2200/13—Crystalline forms, e.g. polymorphs

Definitions

  • the present invention is directed to novel processes for preparing compounds and salts thereof, which compounds are inhibitors of the activity or function of phosphoinositide 3′OH kinase isoform delta (PI3K ⁇ ); novel intermediates; and a novel salt and polymorph thereof.
  • PI3K ⁇ phosphoinositide 3′OH kinase isoform delta
  • R 1′ is 9- or 10-membered bicyclic heteroaryl wherein the 9- or 10-membered bicyclic heteroaryl contains from one to three heteroatoms independently selected from oxygen and nitrogen and is optionally substituted by C 1-6 alkyl, C 3-6 cycloalkyl, halo, —CN or —NHSO 2 R 5′ , or
  • pyridinyl optionally substituted by one or two substituents independently selected from C 1-6 alkyl, —OR 6′ , halo and —NHSO 2 R 7′ ;
  • R 2′ and R 3′ together with the nitrogen atom to which they are attached, are linked to form a 6- or 7-membered heterocyclyl wherein the 6- or 7-membered heterocyclyl optionally contains an oxygen atom or a further nitrogen atom and is optionally substituted by one or two substituents independently selected from C 1-6 alkyl;
  • R 4′ is hydrogen or methyl
  • R 6′ is hydrogen or C 1-4 alkyl
  • R 5′ and R 7′ are each independently C 1-6 alkyl, or phenyl optionally substituted by one or two substituents independently selected from halo;
  • WO2010/125082 describe the preparation of 6-(1H-indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole which may be represented by the formula (II):
  • the present invention provides novel processes for preparing compounds of formula (IV) and salts thereof
  • R 1 and R 2 are as defined below, novel intermediates, and a novel salt and polymorph thereof.
  • FIG. 1 shows an X-ray powder diffraction (XRPD) pattern for a polymorph of 6-(1H-indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole benzoate.
  • XRPD X-ray powder diffraction
  • the present invention provides a process for preparing compounds of formula (IV) and salts thereof
  • R 1a and P are as defined above, followed by conversion of the compound of formula (XI) or a salt thereof to a compound of formula (IV) or a salt thereof, (b) reacting a compound of formula (XI) or a salt thereof with a borylating agent in the presence of a catalyst system to give a compound of formula (XII) or a salt thereof
  • R 1a and P are as defined above, followed by conversion of the compound of formula (XII) or a salt thereof to a compound of formula (IV) or a salt thereof, (c) reacting a compound of formula (XII) or a salt thereof with a compound of formula (XIV) or a salt thereof R 2 —X 1 (XIV) wherein R 2 is as defined above and X 1 is halogen, in the presence of a palladium catalyst to give a compound of formula (XIII) or a salt thereof
  • R 1a , R 2 and P are as defined above, followed by conversion of the compound of formula (XIII) or a salt thereof to a compound of formula (IV) or a salt thereof, and/or (d) reacting a compound of formula (XIII) or a salt thereof with a reducing agent followed by deprotection.
  • the present invention provides processes for making compounds of formula IV comprising at least one of steps a to d.
  • the processes of the present invention may include all four steps or one, two or three of steps a, b, c and d.
  • R 1 is N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl
  • R 1 is
  • Salts of Compounds A and B which may be prepared according to the invention include hydrochloride, hydrobromide, nitrate, methylnitrate, sulfate, bisulfate, sulfamate, phosphate, acetate, hydroxyacetate, phenylacetate, propionate, butyrate, isobutyrate, valerate, maleate, hydroxymaleate, acrylate, fumarate (for example the hemi fumarate), malate, tartrate, citrate, salicylate, p-aminosalicyclate, glycollate, lactate, heptanoate, phthalate, oxalate, succinate (for example the hemi succinate), benzoate, o-acetoxybenzoate, chlorobenzoate, methyl benzoate, dinitrobenzoate, hydroxybenzoate, methoxybenzoate, naphthoate, hydroxynaphthoate, mandelate, tannate, formate, ste
  • the process of the present invention may be used to prepare the hemi succinate salt of Compound A.
  • the process of the present invention may be used to prepare the benzoate salt of Compound A.
  • the benzoate salt of Compound A has certain properties which may make it particularly suitable for development as an inhaled drug, in particular, it has suitable solubility in simulated lung fluid, good chemical and physical stability, and suitable hygroscopicity. Accordingly, 6-(1H-indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole benzoate forms a further aspect of the present invention.
  • 6-(1H-indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole benzoate 6-(1H-Indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole benzoate may exist in crystalline or noncrystalline form, or as a mixture thereof.
  • solvates may be formed wherein solvent molecules are incorporated into the crystalline lattice during crystallization.
  • Solvates may involve nonaqueous solvents such as ethanol, isopropanol, DMSO, acetic acid, ethanolamine, and EtOAc, or they may involve water as the solvent that is incorporated into the crystalline lattice.
  • Solvates wherein water is the solvent that is incorporated into the crystalline lattice are typically referred to as “hydrates”. Hydrates include stoichiometric hydrates as well as compositions containing variable amounts of water.
  • the amount of water may depend upon the conditions, for example humidity. For example, as humidity decreases the amount of water may decrease and as humidity increases the amount of water may increase. Such variations in the amount of water are included within the scope of the invention.
  • the invention provides a polymorph of 6-(1H-indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole benzoate characterised in that it provides an XRPD pattern comprising peaks (° 2 ⁇ ) at about 6.7 and/or about 8.7 and/or about 11.6 and/or about 12.9 and/or about 13.3 and/or about 16.2.
  • the invention provides a polymorph of 6-(1H-indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole benzoate characterised in that it provides an XRPD pattern comprising peaks (° 2 ⁇ ) at about 6.7, about 8.7, about 11.6, about 12.9, about 13.3 and about 16.2.
  • the invention provides a polymorph of 6-(1H-indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole benzoate characterised in that it provides an XRPD pattern comprising peaks substantially as set out in Table 1.
  • the invention provides a polymorph of 6-(1H-indol-4-yl)-4-(5- ⁇ [4-(1-methylethyl)-1-piperazinyl]methyl ⁇ -1,3-oxazol-2-yl)-1H-indazole benzoate characterised in that it provides an XRPD pattern substantially in accordance with FIG. 1 .
  • the present invention provides a process for preparing compounds of formula (XI) and salts thereof
  • P is a protecting group, which process comprises reacting a compound of formula (VII) or a salt thereof
  • R 1a is as defined above, with a compound of formula (X) or a salt thereof
  • the present invention provides a process for preparing compounds of formula (IV) and salts thereof
  • R 1a is as defined above, with a compound of formula (X) or a salt thereof
  • R 1a and P are as defined above, followed by conversion of the compound of formula (XI) or a salt thereof to a compound of formula (IV) or a salt thereof.
  • R 1a is
  • R 1a is
  • the protecting group P may be any suitable protecting group described in, for example, Protective Groups in Organic Synthesis by Wuts and Greene (John Wiley & Sons). In one embodiment, the protecting group is tetrahydro-2H-pyran-2-yl.
  • X is chlorine. In a further embodiment, X is bromine.
  • the palladium catalyst used in the formation of the compound of formula (XI) described above may be any suitable palladium catalyst complex, for example a palladium complex with a suitable ligand.
  • the ligand may be, for example, a Buchwald ligand such as XPhos (2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl) or RuPhos (2-dicyclohexylphosphino-2′,6′-diisopropoxybiphenyl).
  • the palladium catalyst is a palladium complex with XPhos.
  • the compound of formula (VII) or salt thereof may be prepared from ethyl oxazole-5-carboxylic acid, the compound of formula (V) or a salt thereof
  • the compound of formula (VII) or a salt thereof may be prepared directly by treatment of ethyl oxazole-5-carboxylic acid with 1-(isopropyl)piperazine or (2R, 6S)-2,6-dimethylmorpholine in the presence of an enzyme.
  • the enzyme is lyophilised lipase TL.
  • the compound of formula (X) or salt thereof may be prepared by reacting a compound of formula (VIII) or a salt thereof
  • the present invention provides a process for preparing compounds of formula (XI) and salts thereof
  • R 1a is and P are as defined above, which process comprises reacting a compound of formula (Va) or a salt thereof
  • R 3 is C 1-6 alkyl, such as ethyl (to give a compound of formula (V) as defined above), with a compound of formula (X) or a salt thereof
  • X is halogen and P is as defined above, in the presence of a palladium catalyst, followed by hydrolysis and amination with 1-(isopropyl)piperazine or (2R, 6S)-2,6-dimethylmorpholine.
  • the present invention provides a process for preparing compounds of formula (IV) and salts thereof
  • R 1 and R 2 are as defined above, which process comprises reacting a compound of formula (Va) or a salt thereof
  • R 3 is as defined above, with a compound of formula (X) or a salt thereof
  • R 1a and P are as defined above, followed by conversion of the compound of formula (XI) or a salt thereof to a compound of formula (IV) or a salt thereof.
  • the present invention provides a process for preparing compounds of formula (XII) and salts thereof
  • R 1a and P are as defined above, which process comprises reacting a compound of formula (XI) or a salt thereof
  • R 1a and P are as defined above, with a borylating agent in the presence of a catalyst system.
  • the present invention provides a process for preparing compounds of formula (IV) and salts thereof
  • R 1 and R 2 are as defined above, which process comprises reacting a compound of formula (XI) or a salt thereof
  • R 1a and P are as defined above, with a borylating agent in the presence of a catalyst system to give a compound of formula (XII) or a salt thereof
  • R 1a and P are as defined above, followed by conversion of the compound of formula (XII) or a salt thereof to a compound of formula (IV) or a salt thereof.
  • the borylating agent used according to the present invention may be any suitable borylating agent such as pinacolborane.
  • the catalyst system used according to the present invention may be any suitable catalyst system such as an iridium, nickel, iron, rhodium or cobalt catalyst system. Suitable catalyst systems are described in, for example, Chem. Commun., 2015, 51, 6508-6511; J. Am. Chem. Soc., 2013, 135, 17258-17261; and J. Am. Chem. Soc., 2014, 136, 4133-4136.
  • the catalyst system is an iridium catalyst system, for example, (1,5-cyclooctodiene)(methoxy)iridium (I) dimer.
  • the present invention provides a process for preparing compounds of formula (XIII) and salts thereof
  • R 1a , R 2 and P are as defined above, which process comprises reacting a compound of formula (XII) or a salt thereof
  • R 1a and P are as defined above, with a compound of formula (XIV) or a salt thereof R 2 —X 1 (XIV) wherein R 2 is as defined above and X 1 is halogen, in the presence of a palladium catalyst.
  • the present invention provides a process for preparing compounds of formula (IV) and salts thereof
  • R 1a , R 2 and P are as defined above, followed by conversion of the compound of formula (XIII) or a salt thereof to a compound of formula (IV) or a salt thereof.
  • X 1 is chlorine. In a further embodiment, X 1 is bromine.
  • the palladium catalyst used in the formation of the compound of formula (XIII) described above may be any suitable palladium catalyst complex, for example a palladium complex with a suitable ligand.
  • the ligand may be, for example, a Buchwald ligand such as XPhos (2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl) or tricyclohexylphosphine.
  • the palladium catalyst is a palladium complex with XPhos.
  • the present invention provides a process for preparing compounds of formula (IV) and salts thereof
  • R 1 and R 2 are as defined above, which process comprises reacting a compound of formula (XIII) or a salt thereof
  • R 1a , R 2 and P are as defined above, with a reducing agent followed by deprotection.
  • the reducing agent may be any suitable reducing agent such as a hydride, for example, lithium aluminium hydride, sodium borohydride, diisobutylaluminium hydride (DIBAL) or sodium bis(2-methoxyethoxy)aluminium hydride (Red-Al).
  • a hydride for example, lithium aluminium hydride, sodium borohydride, diisobutylaluminium hydride (DIBAL) or sodium bis(2-methoxyethoxy)aluminium hydride (Red-Al).
  • the reducing agent is lithium aluminium hydride.
  • the present invention provides a compound of formula (VII) or a salt thereof wherein R 1a is
  • the present invention provides a compound of formula (XI) or a salt thereof wherein R 1a is
  • the present invention provides a compound of formula (XII) or a salt thereof wherein R 1a is
  • the present invention provides a compound of formula (XIII) or a salt thereof wherein R 1a is
  • Oxalyl chloride (47.7 kg, 375.8 mol) was added to a solution of oxazole-5-carboxylic acid (32.88 kg, 290.8 mol) in isopropyl acetate (144 kg) maintaining the temperature at 52-58° C. The temperature was increased to 58.5° C., stirred for 5 h and then cooled to 20° C. The reaction mixture was added to a solution of 1-(isopropyl)piperazine (41 kg, 319.8 mol) and potassium carbonate (118.4 kg) in isopropyl acetate (348 kg) and water (103 kg) maintaining the temperature below 25° C. The reaction was stirred for 15 mins, the temperature was increased to 33° C.
  • Acetic anhydride (69 kg, 675.9 mol) was added to a stirred slurry of 3-chloro-2-methylaniline (30 kg, 211.9 mol), potassium acetate (25 kg, 254.7 mol) and methyltetrahydrofuran (302 L) at 25° C. and then stirred for 2 h.
  • Isopentyl nitrite (44.5 kg, 379.9 mol) was added to the slurry and the contents were heated to 73° C. for 18 h.
  • the slurry was cooled to 20° C., then water (90 L) was added, and the reaction was cooled to 5° C.
  • Trifluoroacetic acid (3.5 kg, 30.7 mol) was added to a solution of 4-chloro-1H-indazole (23 kg, 15.1 mol) and 3,4-dihydro-2H-pyran (43.1 kg, 512.7 mol) in ethyl acetate (235 L).
  • the reaction mixture was heated to 80° C. for 4 h, then cooled to 23° C., triethylamine (3.2 kg, 31.6 mol) added and stirred for 30 min.
  • the solvent was exchanged to isopropanol using an atmospheric distillation to a final volume of 138 L.
  • the solution was cooled to 55° C. and water (138 L) was added maintaining the temperature.
  • the solution was cooled to 42° C.
  • Methyl cyclohexane (162 L) was added to the vessel maintaining the temperature at 75° C., the contents were then cooled to 62-65° C. and the crystallisation seeded with (4-isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone (90 g) slurried in chilled methyl cyclohexane (0.52 L). The crystallisation was held at 62° C. for 30 mins, cooled to 7° C. and then held at 7° C. overnight. The product was filtered off, washed with methyl cyclohexane (2 ⁇ 72 L) and dried in a vacuum oven at 50° C. to give the title compound (57.2 kg, 88.9%).
  • the reaction mixture was then filtered into another vessel and the filter washed with CPME (20 mL), then distilled down to 30 mL under atmospheric pressure.
  • the contents were cooled to 80° C. and methyl cyclohexane (45 mL) was added to the vessel maintaining the temperature at 75° C., the contents were then cooled to 62-65° C. and the crystallisation seeded with (4-isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone.
  • the crystallisation was held at 63° C. for 30 mins, cooled to 5° C.
  • Pinacolborane (40.80 kg, 318.8 mol) was added to a stirred solution of (4-isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone (54.00 kg, 127.5 mol), (1,5-cyclooctadiene)(methoxy)iridium(I) dimer (0.864 kg, 1.30 mol) and 3,4,7,8-tetramethyl-1,10-phenanthroline (1.51 kg, 6.39 mol) in THF (243.2 kg) at 20° C.
  • the reaction was heated to reflux for 8 h, then cooled to 20° C. and transferred into a vessel containing isopropanol (253.8 kg), washed through with THF (23.8 kg).
  • the solvent was distilled to 270 L at 200 mbar and isopropanol (253.8 kg) was added and then redistilled to 324 L at 100 mbar.
  • the crystallisation is heated to 40° C. for 4 h, cooled to 20° C., stirred overnight, filtered off, washed with isopropanol (84.8 kg), and dried in a vacuum oven at 50° C. to give the title compound (57.35 kg, 82.8%).
  • the reaction mixture was degassed under vacuum 3 ⁇ , then heated to 82° C. for 78 mins, and MIBK (300 L) added.
  • the phases were mixed for 30 mins, then separated and the organic phase washed with an aqueous solution made up from potassium carbonate (2.75 kg), N-acetyl cysteine (5.2 kg) and water (250 kg), then water (250 kg) and distilled down to 300 L at atmospheric pressure.
  • the crystallisation was cooled to 20° C., stirred for 5 h, filtered off, washed with MIBK (80 kg) and dried in the vacuum oven at 50° C. to give the title compound (36.15 kg, 73.7%).
  • the reaction mixture was degassed under vacuum 3 ⁇ , and then palladium acetate (0.14 kg, 0.62 mol) and XPhos (0.45 kg, 0.94 mol) were added rinsed in with MIBK (1 kg).
  • the reaction was heated to reflux for 1 h.
  • the reaction was cooled to less than 40° C. and N-acetyl cysteine (3.59 kg) added, followed by MIBK (138.2 kg).
  • the phases were heated to 82° C., mixed, then separated and the organic phase washed with an aqueous solution made up from potassium carbonate (1.9 kg), N-acetyl cysteine (3.59 kg), MIBK (27.6 kg) and water (173.8 kg), then water (172.8 kg) and distilled down to 155 L at atmospheric pressure.
  • the crystallisation was cooled to 20° C., stirred for 22 h, filtered off, washing with MIBK (2 ⁇ 55.3 kg) and dried in a vacuum oven at 50° C. to give the title compound 24.72 kg, 73%).
  • Aluminium chloride (2.94 kg, 22 mol) was added to THF (216 kg) and stirred until dissolved.
  • (2-(6-(1H-Indol-4-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)(4-isopropylpiperazin-1-yl)methanone 34.75 kg, 64.5 mol
  • THF 0.5 kg
  • a solution of lithium aluminium hydride in THF (10% w/w, 22.6 kg, 59.6 mol) was added maintaining the temperature at less than 20° C., followed by a THF (0.9 kg) line wash.
  • the reaction was stirred for 30 mins and then EtOAc (15.6 kg) added followed by a 1 h stir.
  • a solution of triethanolamine (2.36 kg) in THF (2.1 L) was added followed by triethanolamine (36.8 kg) and then aqueous NaOH (15% w/w, 121 kg).
  • the phases were separated and the organic phase washed with aqueous NaOH (15% w/w, 121 kg), THF (17 kg) added, and the solvent distilled down to 104 L at atmospheric pressure.
  • a constant volume distillation (104 L) was performed by adding MeOH (174 L), and then MeOH (193.3 kg) added. Chlorotrimethylsilane (35.8 kg, 329.5 mol) was added and the reaction heated to 50° C. for 3 h, and then triethylamine (35.8 kg, 353.8 mol) added and the crystallisation cooled to 20° C., filtered off, washed with MeOH (2 ⁇ 55 kg) and dried in the vacuum oven at 50° C. to give the title compound (24.80 kg, 81%).
  • Aluminium chloride (4.25 g, 31.8 mmol) was added to THF (250 mL) and stirred until dissolved. (2-(6-(1H-Indol-4-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)(4-isopropylpiperazin-1-yl)methanone (50 g, 93 mmol) was added to the vessel washed in with THF (100 mL) and the contents cooled to 0-5° C. A solution of lithium aluminium hydride in THF (10% w/w, 35.6 mL, 85 mmol) was added maintaining the temperature at less than 20° C.
  • X-ray powder diffraction (XRPD) data were acquired on a PANalytical X'Pert Pro powder diffractometer, model PW3040/60 using an X'Celerator detector.
  • the acquisition conditions were: radiation: Cu K ⁇ , generator tension: 40 kV, generator current: 45 mA, start angle: 2.0° 2 ⁇ , end angle: 40.0° 2 ⁇ , step size: 0.0167° 2 ⁇ , time per step: 31.75 seconds.
  • the sample was prepared by mounting a few milligrams of sample on a silicon wafer (zero background plate), resulting in a thin layer of powder.
  • the XRPD data for a polymorph of 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole benzoate are shown in FIG. 1 .
  • Characteristic XRPD angles and d-spacings for the solid state form are summarised in Table 1. Peak positions were measured using X'Pert Highscore software.
  • the 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole benzoate seed was obtained by adding acetonitrile as solvent to 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole (19 mg) followed by one equivalent of benzoic acid in THF (3M).

Abstract

The present invention provides novel processes for preparing compounds of formula (IV) and salts thereof
Figure US10266525-20190423-C00001
novel intermediates, and a novel salt and polymorph thereof.

Description

This application is filed pursuant to 35 U.S.C. § 371 as a United States National Phase Application of International Patent Application Serial No. PCT/EP2016/062250 filed May 31, 2016, which claims priority of GB 1509492.3 filed 2 Jun. 2015.
FIELD OF THE INVENTION
The present invention is directed to novel processes for preparing compounds and salts thereof, which compounds are inhibitors of the activity or function of phosphoinositide 3′OH kinase isoform delta (PI3Kδ); novel intermediates; and a novel salt and polymorph thereof.
BACKGROUND TO THE INVENTION
International patent application PCT/EP2010/055666 (publication number WO2010/125082) describes compounds having the general formula (I):
Figure US10266525-20190423-C00002
wherein
R1′ is 9- or 10-membered bicyclic heteroaryl wherein the 9- or 10-membered bicyclic heteroaryl contains from one to three heteroatoms independently selected from oxygen and nitrogen and is optionally substituted by C1-6alkyl, C3-6cycloalkyl, halo, —CN or —NHSO2R5′, or
pyridinyl optionally substituted by one or two substituents independently selected from C1-6alkyl, —OR6′, halo and —NHSO2R7′;
R2′ and R3′, together with the nitrogen atom to which they are attached, are linked to form a 6- or 7-membered heterocyclyl wherein the 6- or 7-membered heterocyclyl optionally contains an oxygen atom or a further nitrogen atom and is optionally substituted by one or two substituents independently selected from C1-6alkyl;
R4′ is hydrogen or methyl;
R6′ is hydrogen or C1-4alkyl; and
R5′ and R7′ are each independently C1-6alkyl, or phenyl optionally substituted by one or two substituents independently selected from halo;
and salts thereof.
The examples of WO2010/125082 describe the preparation of 6-(1H-indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole which may be represented by the formula (II):
Figure US10266525-20190423-C00003
hereinafter referred to as “Compound A” and the hydrochloride salts thereof, and the preparation of N-[5-[4-(5-{[(2R,6S)-2,6-dimethyl-4-morpholinyl]methyl}-1,3-oxazol-2-yl)-1H-indazol-6-yl]-2-(methyloxy)-3-pyridinyl]methanesulfonamide which may be represented by the formula (III):
Figure US10266525-20190423-C00004
hereinafter referred to as “Compound B” and the (R)-mandelate salt thereof.
International patent application PCT/EP2011/068604 (publication number WO2012/055846) describes a novel polymorph of Compound A and salts of Compound A and polymorphs thereof, processes for their preparation, pharmaceutical compositions comprising them, and their use in the treatment of various disorders.
International patent application PCT/EP2011/065419 (publication number WO2012/032067) describes novel polymorphs and salts of Compound B, processes for their preparation, pharmaceutical compositions comprising them, and their use in the treatment of various disorders.
The processes for preparing Compounds A and B described in WO2010/125082, WO2012/055846 and WO2012/032067 are unsuitable for manufacturing the compounds on a commercial scale. For example, one of the methods described uses a stannane reagent in the key oxazole-indazole coupling step. Stannane reagents are typically toxic and environmentally harmful. An alternative process which avoids the use of a stannane reagent is described in WO2012/055846. However, this process requires a significant number of steps, starts from expensive starting materials and has a poor overall yield.
There therefore remains a need to develop an improved process for preparing Compounds A and B which may be suitable for use on a commercial scale.
SUMMARY OF THE INVENTION
The present invention provides novel processes for preparing compounds of formula (IV) and salts thereof
Figure US10266525-20190423-C00005
wherein R1 and R2 are as defined below, novel intermediates, and a novel salt and polymorph thereof.
BRIEF DESCRIPTION OF THE FIGURES
FIG. 1 shows an X-ray powder diffraction (XRPD) pattern for a polymorph of 6-(1H-indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole benzoate.
 DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a number of aspects relating to a process which is summarised in Scheme 1 below:
Figure US10266525-20190423-C00006
Thus, in one aspect, the present invention provides a process for preparing compounds of formula (IV) and salts thereof
Figure US10266525-20190423-C00007
wherein
R1 is
Figure US10266525-20190423-C00008
and
R2 is
Figure US10266525-20190423-C00009
or
R1 is
Figure US10266525-20190423-C00010
and
R2 is
Figure US10266525-20190423-C00011
which process comprises:
(a) reacting a compound of formula (VII) or a salt thereof
Figure US10266525-20190423-C00012
wherein R1a is
Figure US10266525-20190423-C00013
with a compound of formula (X) or a salt thereof
Figure US10266525-20190423-C00014
wherein X is halogen and P is a protecting group, in the presence of a palladium catalyst to give a compound of formula (XI) or a salt thereof
Figure US10266525-20190423-C00015
wherein R1a and P are as defined above, followed by conversion of the compound of formula (XI) or a salt thereof to a compound of formula (IV) or a salt thereof,
(b) reacting a compound of formula (XI) or a salt thereof with a borylating agent in the presence of a catalyst system to give a compound of formula (XII) or a salt thereof
Figure US10266525-20190423-C00016
wherein R1a and P are as defined above, followed by conversion of the compound of formula (XII) or a salt thereof to a compound of formula (IV) or a salt thereof,
(c) reacting a compound of formula (XII) or a salt thereof with a compound of formula (XIV) or a salt thereof
R2—X1   (XIV)
wherein R2 is as defined above and X1 is halogen, in the presence of a palladium catalyst to give a compound of formula (XIII) or a salt thereof
Figure US10266525-20190423-C00017
wherein R1a, R2 and P are as defined above, followed by conversion of the compound of formula (XIII) or a salt thereof to a compound of formula (IV) or a salt thereof, and/or
(d) reacting a compound of formula (XIII) or a salt thereof with a reducing agent followed by deprotection.
The present invention provides processes for making compounds of formula IV comprising at least one of steps a to d. The processes of the present invention may include all four steps or one, two or three of steps a, b, c and d.
In one embodiment, R1 is
Figure US10266525-20190423-C00018
and R2 is
Figure US10266525-20190423-C00019
such that the compound of formula (IV) or salt thereof produced by the process of the invention is Compound A or a salt thereof.
In a further embodiment, R1 is
Figure US10266525-20190423-C00020
and R2 is
Figure US10266525-20190423-C00021
such that the compound of formula (IV) or salt thereof produced by the process of the invention is Compound B or a salt thereof.
Salts of Compounds A and B which may be prepared according to the invention include hydrochloride, hydrobromide, nitrate, methylnitrate, sulfate, bisulfate, sulfamate, phosphate, acetate, hydroxyacetate, phenylacetate, propionate, butyrate, isobutyrate, valerate, maleate, hydroxymaleate, acrylate, fumarate (for example the hemi fumarate), malate, tartrate, citrate, salicylate, p-aminosalicyclate, glycollate, lactate, heptanoate, phthalate, oxalate, succinate (for example the hemi succinate), benzoate, o-acetoxybenzoate, chlorobenzoate, methyl benzoate, dinitrobenzoate, hydroxybenzoate, methoxybenzoate, naphthoate, hydroxynaphthoate, mandelate, tannate, formate, stearate, ascorbate, palmitate, oleate, pyruvate, pamoate (for example the hemi pamoate), malonate, laurate, glutarate, glutamate, estolate, methanesulfonate (mesylate), ethanesulfonate (esylate), 2-hydroxyethanesulfonate, benzenesulfonate (besylate), p-aminobenzenesulfonate, p-toluenesulfonate (tosylate), napthalene-2-sulfonate, naphthalenedisulfonate (for example the hemi naphthalenedisulfonate), mesitylenesulfonate, biphenyldisulfonate (for example the hemi biphenyldisulfonate), cinnamate (for example the hemi cinnamate), sebacate (for example the hemi sebacate), pyromellitate (for example the hemi pyromellitate) and benzenediacrylate (for example hemi benzenediacrylate salt).
In one embodiment, the process of the present invention may be used to prepare the hemi succinate salt of Compound A. In another embodiment, the process of the present invention may be used to prepare the benzoate salt of Compound A. The benzoate salt of Compound A has certain properties which may make it particularly suitable for development as an inhaled drug, in particular, it has suitable solubility in simulated lung fluid, good chemical and physical stability, and suitable hygroscopicity. Accordingly, 6-(1H-indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole benzoate forms a further aspect of the present invention.
Also included within the scope of the invention are any solvates, for example hydrates, complexes and polymorphic forms of 6-(1H-indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole benzoate. 6-(1H-Indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole benzoate may exist in crystalline or noncrystalline form, or as a mixture thereof. For salts that are in crystalline form, the skilled artisan will appreciate that pharmaceutically acceptable solvates may be formed wherein solvent molecules are incorporated into the crystalline lattice during crystallization. Solvates may involve nonaqueous solvents such as ethanol, isopropanol, DMSO, acetic acid, ethanolamine, and EtOAc, or they may involve water as the solvent that is incorporated into the crystalline lattice. Solvates wherein water is the solvent that is incorporated into the crystalline lattice are typically referred to as “hydrates”. Hydrates include stoichiometric hydrates as well as compositions containing variable amounts of water. As the skilled person will appreciate, the amount of water may depend upon the conditions, for example humidity. For example, as humidity decreases the amount of water may decrease and as humidity increases the amount of water may increase. Such variations in the amount of water are included within the scope of the invention.
In one embodiment, the invention provides a polymorph of 6-(1H-indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole benzoate characterised in that it provides an XRPD pattern comprising peaks (° 2θ) at about 6.7 and/or about 8.7 and/or about 11.6 and/or about 12.9 and/or about 13.3 and/or about 16.2.
In one embodiment, the invention provides a polymorph of 6-(1H-indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole benzoate characterised in that it provides an XRPD pattern comprising peaks (° 2θ) at about 6.7, about 8.7, about 11.6, about 12.9, about 13.3 and about 16.2.
In another embodiment, the invention provides a polymorph of 6-(1H-indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole benzoate characterised in that it provides an XRPD pattern comprising peaks substantially as set out in Table 1.
In a further embodiment, the invention provides a polymorph of 6-(1H-indol-4-yl)-4-(5-{[4-(1-methylethyl)-1-piperazinyl]methyl}-1,3-oxazol-2-yl)-1H-indazole benzoate characterised in that it provides an XRPD pattern substantially in accordance with FIG. 1.
When it is indicated herein that there is a peak in an XRPD pattern at a given value, it is typically meant that the peak is within ±0.2 of the value quoted, for example within ±0.1 of the value quoted.
In another aspect, the present invention provides a process for preparing compounds of formula (XI) and salts thereof
Figure US10266525-20190423-C00022
wherein R1a is
Figure US10266525-20190423-C00023
and P is a protecting group,
which process comprises reacting a compound of formula (VII) or a salt thereof
Figure US10266525-20190423-C00024
wherein R1a is as defined above, with a compound of formula (X) or a salt thereof
Figure US10266525-20190423-C00025
wherein X is halogen and P is as defined above, in the presence of a palladium catalyst.
In another aspect, the present invention provides a process for preparing compounds of formula (IV) and salts thereof
Figure US10266525-20190423-C00026
wherein
R1 is
Figure US10266525-20190423-C00027
and
R2 is
Figure US10266525-20190423-C00028
or
R1 is
Figure US10266525-20190423-C00029
and
R2 is
Figure US10266525-20190423-C00030
which process comprises reacting a compound of formula (VII) or a salt thereof
Figure US10266525-20190423-C00031
wherein R1a is as defined above, with a compound of formula (X) or a salt thereof
Figure US10266525-20190423-C00032
wherein X and P are as defined above, in the presence of a palladium catalyst to give a compound of formula (XI) or a salt thereof
Figure US10266525-20190423-C00033
wherein R1a and P are as defined above, followed by conversion of the compound of formula (XI) or a salt thereof to a compound of formula (IV) or a salt thereof.
In one embodiment, R1a is
Figure US10266525-20190423-C00034
In a further embodiment, R1a is
Figure US10266525-20190423-C00035
The protecting group P may be any suitable protecting group described in, for example, Protective Groups in Organic Synthesis by Wuts and Greene (John Wiley & Sons). In one embodiment, the protecting group is tetrahydro-2H-pyran-2-yl.
In one embodiment, X is chlorine. In a further embodiment, X is bromine.
The palladium catalyst used in the formation of the compound of formula (XI) described above may be any suitable palladium catalyst complex, for example a palladium complex with a suitable ligand. The ligand may be, for example, a Buchwald ligand such as XPhos (2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl) or RuPhos (2-dicyclohexylphosphino-2′,6′-diisopropoxybiphenyl). In one embodiment, the palladium catalyst is a palladium complex with XPhos.
The compound of formula (VII) or salt thereof may be prepared from ethyl oxazole-5-carboxylic acid, the compound of formula (V) or a salt thereof
Figure US10266525-20190423-C00036
by hydrolysis to give oxazole-5-carboxylic acid, the compound of formula (VI) or a salt thereof
Figure US10266525-20190423-C00037
followed by amination with 1-(isopropyl)piperazine or (2R, 6S)-2,6-dimethylmorpholine.
Alternatively, the compound of formula (VII) or a salt thereof may be prepared directly by treatment of ethyl oxazole-5-carboxylic acid with 1-(isopropyl)piperazine or (2R, 6S)-2,6-dimethylmorpholine in the presence of an enzyme. In one embodiment, the enzyme is lyophilised lipase TL.
The compound of formula (X) or salt thereof may be prepared by reacting a compound of formula (VIII) or a salt thereof
Figure US10266525-20190423-C00038
wherein X is as defined above, with isoamyl nitrite, followed by protection.
Alternatively, in another aspect, the present invention provides a process for preparing compounds of formula (XI) and salts thereof
Figure US10266525-20190423-C00039
wherein R1a is and P are as defined above, which process comprises reacting a compound of formula (Va) or a salt thereof
Figure US10266525-20190423-C00040
wherein R3 is C1-6alkyl, such as ethyl (to give a compound of formula (V) as defined above), with a compound of formula (X) or a salt thereof
Figure US10266525-20190423-C00041
wherein X is halogen and P is as defined above, in the presence of a palladium catalyst, followed by hydrolysis and amination with 1-(isopropyl)piperazine or (2R, 6S)-2,6-dimethylmorpholine.
In another aspect, the present invention provides a process for preparing compounds of formula (IV) and salts thereof
Figure US10266525-20190423-C00042
wherein R1 and R2 are as defined above,
which process comprises reacting a compound of formula (Va) or a salt thereof
Figure US10266525-20190423-C00043
wherein R3 is as defined above, with a compound of formula (X) or a salt thereof
Figure US10266525-20190423-C00044
wherein X and P are as defined above, in the presence of a palladium catalyst, followed by hydrolysis and amination with 1-(isopropyl)piperazine or (2R, 6S)-2,6-dimethylmorpholine, to give a compound of formula (XI) or a salt thereof
Figure US10266525-20190423-C00045
wherein R1a and P are as defined above, followed by conversion of the compound of formula (XI) or a salt thereof to a compound of formula (IV) or a salt thereof.
In another aspect, the present invention provides a process for preparing compounds of formula (XII) and salts thereof
Figure US10266525-20190423-C00046
wherein R1a and P are as defined above,
which process comprises reacting a compound of formula (XI) or a salt thereof
Figure US10266525-20190423-C00047
wherein R1a and P are as defined above, with a borylating agent in the presence of a catalyst system.
In another aspect, the present invention provides a process for preparing compounds of formula (IV) and salts thereof
Figure US10266525-20190423-C00048
wherein R1 and R2 are as defined above,
which process comprises reacting a compound of formula (XI) or a salt thereof
Figure US10266525-20190423-C00049
wherein R1a and P are as defined above, with a borylating agent in the presence of a catalyst system to give a compound of formula (XII) or a salt thereof
Figure US10266525-20190423-C00050
wherein R1a and P are as defined above, followed by conversion of the compound of formula (XII) or a salt thereof to a compound of formula (IV) or a salt thereof.
The borylating agent used according to the present invention may be any suitable borylating agent such as pinacolborane.
The catalyst system used according to the present invention may be any suitable catalyst system such as an iridium, nickel, iron, rhodium or cobalt catalyst system. Suitable catalyst systems are described in, for example, Chem. Commun., 2015, 51, 6508-6511; J. Am. Chem. Soc., 2013, 135, 17258-17261; and J. Am. Chem. Soc., 2014, 136, 4133-4136. In one embodiment, the catalyst system is an iridium catalyst system, for example, (1,5-cyclooctodiene)(methoxy)iridium (I) dimer.
In another aspect, the present invention provides a process for preparing compounds of formula (XIII) and salts thereof
Figure US10266525-20190423-C00051
wherein R1a, R2 and P are as defined above,
which process comprises reacting a compound of formula (XII) or a salt thereof
Figure US10266525-20190423-C00052
wherein R1a and P are as defined above, with a compound of formula (XIV) or a salt thereof
R2—X1   (XIV)
wherein R2 is as defined above and X1 is halogen, in the presence of a palladium catalyst.
In another aspect, the present invention provides a process for preparing compounds of formula (IV) and salts thereof
Figure US10266525-20190423-C00053
wherein R1 and R2 are as defined above,
which process comprises reacting a compound of formula (XII)
Figure US10266525-20190423-C00054
wherein R1a and P are as defined above, with a compound of formula (XIV)
R2—X1   (XIV)
wherein R2 is as defined above and X1 is halogen, in the presence of a palladium catalyst to give a compound of formula (XIII)
Figure US10266525-20190423-C00055
wherein R1a, R2 and P are as defined above, followed by conversion of the compound of formula (XIII) or a salt thereof to a compound of formula (IV) or a salt thereof.
In one embodiment, X1 is chlorine. In a further embodiment, X1 is bromine.
The palladium catalyst used in the formation of the compound of formula (XIII) described above may be any suitable palladium catalyst complex, for example a palladium complex with a suitable ligand. The ligand may be, for example, a Buchwald ligand such as XPhos (2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl) or tricyclohexylphosphine. In one embodiment, the palladium catalyst is a palladium complex with XPhos.
In a further aspect, the present invention provides a process for preparing compounds of formula (IV) and salts thereof
Figure US10266525-20190423-C00056
wherein R1 and R2 are as defined above,
which process comprises reacting a compound of formula (XIII) or a salt thereof
Figure US10266525-20190423-C00057
wherein R1a, R2 and P are as defined above, with a reducing agent followed by deprotection.
The reducing agent may be any suitable reducing agent such as a hydride, for example, lithium aluminium hydride, sodium borohydride, diisobutylaluminium hydride (DIBAL) or sodium bis(2-methoxyethoxy)aluminium hydride (Red-Al). In one embodiment, the reducing agent is lithium aluminium hydride.
As a person skilled in the art will appreciate, the conditions required for deprotection will depend on the nature of the protecting group. If the protecting group used is tetrahydro-2H-pyran-2-yl, it may be removed under acidic conditions. The intermediate compounds of formulae (VII), (XI), (XII) and (XIII) are novel and thus the compounds and their salts form another aspect of the invention.
In one embodiment, the present invention provides a compound of formula (VII) or a salt thereof wherein R1a is
Figure US10266525-20190423-C00058
In another embodiment, the present invention provides a compound of formula (XI) or a salt thereof wherein R1a is
Figure US10266525-20190423-C00059
and P is tetrahydro-2H-pyran-2-yl.
In another embodiment, the present invention provides a compound of formula (XII) or a salt thereof wherein R1a is
Figure US10266525-20190423-C00060
and P is tetrahydro-2H-pyran-2-yl.
In another embodiment, the present invention provides a compound of formula (XIII) or a salt thereof wherein R1a is
Figure US10266525-20190423-C00061
R2 is
Figure US10266525-20190423-C00062
and P is tetrahydro-2H-pyran-2-yl.
A particular embodiment of the present invention is shown in Scheme 2 below and is described in detail in the following Examples, which are intended for illustration only and are not intended to limit the scope of the invention in any way.
Figure US10266525-20190423-C00063
As used herein the symbols and conventions used in these processes, schemes and examples are consistent with those used in the contemporary scientific literature, for example, the Journal of the American Chemical Society or the Journal of Biological Chemistry. Unless otherwise noted, all starting materials were obtained from commercial suppliers and used without further purification. Specifically, the following abbreviations may be used in the examples and throughout the specification:
Ac Acetyl
COD 1,5-Cyclooctadiene
CPME Cyclopentyl methyl ether
DHP 3,4-Dihydro-2H-pyran
DMSO Dimethyl sulphoxide
Et Ethyl
EtOAc Ethyl acetate
g Grams
h Hour(s)
IPA isopropanol
iPr isopropyl
HPLC High performance liquid chromatography
kg kilograms
L Liter
Me Methyl
Mg Milligrams
MIBK Methyl isobutyl ketone
Min Minute(s)
ml Milliliters
mol Moles
mmol Millimoles
Pin Pinacol
RuPhos 2-dicyclohexylphosphino-2′,6′-diisopropoxybiphenyl
Rt Retention time
TFA Trifluoroacetic acid
THF Tetrahydrofuran
TMS Trimethylsilane
XPhos 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl
XRPD X-ray powder diffraction
EXAMPLES Intermediate 1 Oxazole-5-carboxylic Acid
Figure US10266525-20190423-C00064
An aqueous solution of lithium hydroxide monohydrate (124.5 kg of a solution prepared from 49.44 kg lithium hydroxide monohydrate dissolved in 319 kg water, 398 mol) was added to a solution of ethyl 5-oxazolecarboxylate (54 kg, 382.7 mol) in water (54 kg) maintaining the temperature below 25° C. The reaction was stirred for 6.5 h and then conc. aqueous HCl (64.8 kg) was added maintaining the temperature below 25° C., the crystallisation cooled to 5° C. and held for 1 h. The product was filtered off, washed with cold water (88 kg), then isopropanol (171 kg) and dried under vacuum at 50° C. to give the title compound (37.88 kg, 87.5%).
1H NMR (400 MHz, DMSO-d6) δ ppm 13.68 (br. s., 1H), 8.59 (s, 1H), and 7.88 (s, 1H).
Intermediate 2 (4-Isopropylpiperazin-1-yl)(oxazol-5-yl)methanone
Figure US10266525-20190423-C00065
Method A
Oxalyl chloride (47.7 kg, 375.8 mol) was added to a solution of oxazole-5-carboxylic acid (32.88 kg, 290.8 mol) in isopropyl acetate (144 kg) maintaining the temperature at 52-58° C. The temperature was increased to 58.5° C., stirred for 5 h and then cooled to 20° C. The reaction mixture was added to a solution of 1-(isopropyl)piperazine (41 kg, 319.8 mol) and potassium carbonate (118.4 kg) in isopropyl acetate (348 kg) and water (103 kg) maintaining the temperature below 25° C. The reaction was stirred for 15 mins, the temperature was increased to 33° C. and the organic phase washed with water (191 kg), concentrated under reduced pressure to 95 L and cooled to 20° C. n-Heptane (157 kg) was added and the crystallisation stirred for 2 h, and the product filtered off, washed with n-heptane (157 kg) and dried under vacuum 40° C. to give the title compound (57.14 kg, 88.0%).
1H NMR (400 MHz, CDCl3-d) δ ppm 7.94 (s, 1H), 7.56 (s, 1H), 3.91-3.73 (m, 4H), 2.75 (spt., J=6.5 Hz, 1H), 2.63-2.52 (m, 4H) and 1.06 (d, J=6.6 Hz, 6H).
Method B
1-Isopropylpiperazine (1.06 g, 8.24 mmol) and ethyl-oxazole-5-carboxylate (1.16 g, 8.24 mmol) were added to a suspension of 5 Å molecular sieves (8.0 g) in cyclopentyl methyl ether (40 mL) and stirred for 1 h at 55° C. Lyophilised lipase TL (2.0 g) was added, the reaction mixture stirred for 28.75 h, then filtered through glass fibre paper, washed through with cyclopentyl methyl esther (3×6 mL). The combined filtrate and washings were concentrated under reduced pressure and the crude residue re-slurried in methyl cyclohexane (6 mL), filtered off, washed with methyl cyclohexane (2×5 mL), and dried under vacuum to give the title compound (1.40 g, 76%).
Intermediate 3 4-Chloro-1H-indazole
Figure US10266525-20190423-C00066
Acetic anhydride (69 kg, 675.9 mol) was added to a stirred slurry of 3-chloro-2-methylaniline (30 kg, 211.9 mol), potassium acetate (25 kg, 254.7 mol) and methyltetrahydrofuran (302 L) at 25° C. and then stirred for 2 h. Isopentyl nitrite (44.5 kg, 379.9 mol) was added to the slurry and the contents were heated to 73° C. for 18 h. The slurry was cooled to 20° C., then water (90 L) was added, and the reaction was cooled to 5° C. An aqueous solution of NaOH (105 L of a 32% w/w) was added, the solution was heated to 40° C. and stirred for 2 h. The lower aqueous phase was removed and the organic layer washed with water (150 L) and then brine (18 kg in 90 L water). The organic layer was concentrated to 90 L by atmospheric distillation and a solvent exchange to n-heptane performed by atmospheric distillation to a final volume of 240 L. The slurry was cooled to 7° C., stirred for 2 h and solid isolated by filtration. The cake was washed with heptane (2×60 L) and dried under vacuum to give the title compound (23.6 kg, 73%).
1H NMR (400 MHz, MeOD-d4) δ=8.08 (s, 1H), 7.48 (d, J=8.6 Hz, 1H), 7.33 (dd, J=7.5, 8.4 Hz, 1H), 7.14 (d, J=7.3 Hz, 1H)
HPLC r.t—1.94 min.
Intermediate 4 4-Chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole
Figure US10266525-20190423-C00067
Trifluoroacetic acid (3.5 kg, 30.7 mol) was added to a solution of 4-chloro-1H-indazole (23 kg, 15.1 mol) and 3,4-dihydro-2H-pyran (43.1 kg, 512.7 mol) in ethyl acetate (235 L). The reaction mixture was heated to 80° C. for 4 h, then cooled to 23° C., triethylamine (3.2 kg, 31.6 mol) added and stirred for 30 min. The solvent was exchanged to isopropanol using an atmospheric distillation to a final volume of 138 L. The solution was cooled to 55° C. and water (138 L) was added maintaining the temperature. The solution was cooled to 42° C. and seeded (8 g), then cooled to 30° C., held for 10 h, and water (46 L) added, cooled to 18° C., and the slurry was stirred for 2 h then filtered off, washed with 6:1 v/v water/2-propanol (2×46 L) and dried under vacuum at 50° C. to give the title compound (28.8 kg, 80.7%).
1H NMR (500 MHz, DMSO-d6) δ=8.18 (s, 1H), 7.74 (d, J=8.5 Hz, 1H), 7.42 (dd, J=7.5, 8.4 Hz, 1H), 7.27 (d, J=7.3 Hz, 1H), 5.88 (dd, J=2.5, 9.5 Hz, 1H), 3.90-3.85 (m, 1H), 3.79-3.70 (m, 1H), 2.44-2.35 (m, 1H), 2.07-1.95 (m, 2H), 1.81-1.69 (m, 1H), 1.64-1.53 (m, 2H).
Intermediate 5 (4-Isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone
Figure US10266525-20190423-C00068
Method A
Palladium chloride (0.74 kg, 4.2 mol) and XPhos (4.36 kg, 9.1 mol) was suspended in cyclopentyl methyl ether (372 L). 4-Chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (36 kg, 152.1 mol), (4-Isopropylpiperazin-1-yl)(oxazol-5-yl)methanone (34.78 kg, 155.8 mol) and potassium carbonate (325 mesh, 35.64 kg, 257.9 mol) were added and rinsed in with cyclopentyl methyl ether (2.58 kg). A solution of pivalic acid (9.294 kg, 91.0 mol) dissolved in cyclopentyl methyl ether (10 L) was added followed by a rinse of cyclopentyl methyl ether (10 L). The reaction was vacuum degassed and back-filled with nitrogen three times, then heated to reflux for 5 h and the contents cooled to 40° C. The reaction mixture was washed with water (144 L) then 5% w/v aqueous sodium chloride solution (151.2 kg) and the organic phase was concentrated at atmospheric pressure to 288 L. The reaction mixture was filtered into another vessel and the filter washed with cyclopentyl methyl ether (36 L), then distilled to 108 L under atmospheric pressure. Methyl cyclohexane (162 L) was added to the vessel maintaining the temperature at 75° C., the contents were then cooled to 62-65° C. and the crystallisation seeded with (4-isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone (90 g) slurried in chilled methyl cyclohexane (0.52 L). The crystallisation was held at 62° C. for 30 mins, cooled to 7° C. and then held at 7° C. overnight. The product was filtered off, washed with methyl cyclohexane (2×72 L) and dried in a vacuum oven at 50° C. to give the title compound (57.2 kg, 88.9%).
1H NMR (400 MHz, DMSO-d6) δ ppm 8.59 (s, 1H), 8.00 (d, J=8.6 Hz, 1H), 7.95 (s, 1H), 7.91 (d, J=7.3 Hz, 1H), 7.62 (dd, J=7.3, 8.3 Hz, 1H), 5.97 (dd, J=2.0, 9.5 Hz, 1H), 4.03-3.85 (m, 1H), 3.84-3.70 (m, 1H), 3.66 (br. s., 4H), 2.72 (spt., J=6.5 Hz, 1H), 2.57-2.40 (m, 5H), 2.11-1.96 (m, 2H), 1.85-1.68 (m, 1H), 1.68-1.47 (m, 2H), 0.99 (d, J=6.4 Hz, 6H)
Method B
4-Chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (10 g, 42.2 mmol), (4-Isopropylpiperazin-1-yl)(oxazol-5-yl)methanone (9.67 g, 43.3 mmol), potassium carbonate (325 mesh, 9.93 g, 71.8 mmol) and pivalic acid (2.59 g, 25.3 mmol) were suspended in CPME (90 mL). The reaction was stirred for 10 mins at room temperature and then vacuum degassed and back-filled with nitrogen three times. Palladium chloride (206 mg, 1.16 mmol) and XPhos (1.21 g, 2.53 mmol) were added and rinsed in with CPME (10 mL). The reaction mixture was vacuum degassed and back-filled with nitrogen three times, then heated to reflux for 5 h and the contents cooled back to 50° C. The reaction mixture was washed with 3% w/w aqueous sodium chloride solution (30 mL), then 20% w/w aqueous sodium chloride solution (30 mL) and the organic phase was concentrated at atmospheric pressure down to 80 mL. The reaction mixture was cooled to room temperature and held overnight. The reaction mixture was then filtered into another vessel and the filter washed with CPME (20 mL), then distilled down to 30 mL under atmospheric pressure. The contents were cooled to 80° C. and methyl cyclohexane (45 mL) was added to the vessel maintaining the temperature at 75° C., the contents were then cooled to 62-65° C. and the crystallisation seeded with (4-isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone. The crystallisation was held at 63° C. for 30 mins, cooled to 5° C. over 6 h and then held at 5° C. overnight. The product was filtered off, washed with chilled methyl cyclohexane (2×20 mL) and dried in a vacuum oven at 50° C. to give the title compound (13.52 g, 76%).
1H NMR (400 MHz, DMSO-d6) δ ppm 8.59 (s, 1H), 8.00 (d, J=8.6 Hz, 1H), 7.95 (s, 1H), 7.91 (d, J=7.3 Hz, 1H), 7.62 (dd, J=7.3, 8.3 Hz, 1H), 5.97 (dd, J=2.0, 9.5 Hz, 1H), 4.03-3.85 (m, 1H), 3.84-3.70 (m, 1H), 3.66 (br. s., 4H), 2.72 (spt., J=6.5 Hz, 1H), 2.57-2.40 (m, 5H), 2.11-1.96 (m, 2H), 1.85-1.68 (m, 1H), 1.68-1.47 (m, 2H), 0.99 (d, J=6.4 Hz, 6H)
Intermediate 6 (4-Isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone
Figure US10266525-20190423-C00069
Pinacolborane (40.80 kg, 318.8 mol) was added to a stirred solution of (4-isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone (54.00 kg, 127.5 mol), (1,5-cyclooctadiene)(methoxy)iridium(I) dimer (0.864 kg, 1.30 mol) and 3,4,7,8-tetramethyl-1,10-phenanthroline (1.51 kg, 6.39 mol) in THF (243.2 kg) at 20° C. The reaction was heated to reflux for 8 h, then cooled to 20° C. and transferred into a vessel containing isopropanol (253.8 kg), washed through with THF (23.8 kg). The solvent was distilled to 270 L at 200 mbar and isopropanol (253.8 kg) was added and then redistilled to 324 L at 100 mbar. The crystallisation is heated to 40° C. for 4 h, cooled to 20° C., stirred overnight, filtered off, washed with isopropanol (84.8 kg), and dried in a vacuum oven at 50° C. to give the title compound (57.35 kg, 82.8%).
1H NMR (400 MHz, CDCl3-d) δ ppm 8.70 (s, 1H), 8.40 (s, 1H), 8.17 (s, 1H), 7.74 (s, 1H), 5.85 (dd, J=2.4, 9.5 Hz, 1H), 4.11-4.03 (m, 1H), 3.97-3.77 (m, 5H), 2.78 (spt., J=6.4 Hz, 1H), 2.70-2.59 (m, 5H), 2.24-2.14 (m, 1H), 2.14-2.03 (m, 1H), 1.86-1.72 (m, 2H), 1.72-1.62 (m, 1H), 1.40 (s, 12H), 1.08 (d, J=6.4 Hz, 6H).
Intermediate 7 (2-(6-(1H-indol-4-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)(4-isopropylpiperazin-1-yl)methanone
Figure US10266525-20190423-C00070
Method A
4-Chloroindole (13.8 kg, 91.04 mol) was added to a stirred solution of (4-isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone (50 kg, 91.00 mol), palladium acetate (0.2 kg, 0.89 mol), XPhos (0.65 kg, 1.36 mol), and potassium phosphate (46.4 kg, 218.6 mol) in MIBK (176 kg) and water (250 kg). The reaction mixture was degassed under vacuum 3×, then heated to 82° C. for 78 mins, and MIBK (300 L) added. The phases were mixed for 30 mins, then separated and the organic phase washed with an aqueous solution made up from potassium carbonate (2.75 kg), N-acetyl cysteine (5.2 kg) and water (250 kg), then water (250 kg) and distilled down to 300 L at atmospheric pressure. The crystallisation was cooled to 20° C., stirred for 5 h, filtered off, washed with MIBK (80 kg) and dried in the vacuum oven at 50° C. to give the title compound (36.15 kg, 73.7%).
1H NMR (400 MHz, CDCl3-d) δ ppm 8.72 (s, 1H), 8.38 (br. s, 1H), 8.35 (d, J=1.0 Hz, 1H), 8.06 (s, 1H), 7.81 (s, 1H), 7.52-7.46 (m, 1H), 7.36-7.30 (m, 3H), 6.79-6.75 (m, 1H), 5.84 (dd, J=9.17, 2.32 Hz, 1H), 4.10-4.04 (m, 1H), 3.88 (br. s., 4H), 3.84-3.72 (m, 1H), 2.76 (spt., J=6.5 Hz, 1H), 2.68-2.59 (m, 5H), 2.30-2.12 (m, 2H), 1.86-1.73 (m, 2H), 1.73-1.64 (m, 1H), 1.07 (d, J=6.60 Hz, 6H).
Method B
4-Chloroindole (8.71 kg, 57.46 mol) was added to a stirred solution of (4-isopropylpiperazin-1-yl)(2-(1-(tetrahydro-2H-pyran-2-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazol-4-yl)oxazol-5-yl)methanone (34.55 kg, 62.88 mol), and potassium phosphate (32.1 kg, 151.2 mol) in MIBK (139.2 kg) and water (172.8 kg). The reaction mixture was degassed under vacuum 3×, and then palladium acetate (0.14 kg, 0.62 mol) and XPhos (0.45 kg, 0.94 mol) were added rinsed in with MIBK (1 kg). The reaction was heated to reflux for 1 h. The reaction was cooled to less than 40° C. and N-acetyl cysteine (3.59 kg) added, followed by MIBK (138.2 kg). The phases were heated to 82° C., mixed, then separated and the organic phase washed with an aqueous solution made up from potassium carbonate (1.9 kg), N-acetyl cysteine (3.59 kg), MIBK (27.6 kg) and water (173.8 kg), then water (172.8 kg) and distilled down to 155 L at atmospheric pressure. The crystallisation was cooled to 20° C., stirred for 22 h, filtered off, washing with MIBK (2×55.3 kg) and dried in a vacuum oven at 50° C. to give the title compound 24.72 kg, 73%).
1H NMR (400 MHz, CDCl3-d) δ ppm 8.72 (s, 1H), 8.38 (br. s, 1H), 8.35 (d, J=1.0 Hz, 1H), 8.06 (s, 1H), 7.81 (s, 1H), 7.52-7.46 (m, 1H), 7.36-7.30 (m, 3H), 6.79-6.75 (m, 1H), 5.84 (dd, J=9.17, 2.32 Hz, 1H), 4.10-4.04 (m, 1H), 3.88 (br. s., 4H), 3.84-3.72 (m, 1H), 2.76 (spt., J=6.5 Hz, 1H), 2.68-2.59 (m, 5H), 2.30-2.12 (m, 2H), 1.86-1.73 (m, 2H), 1.73-1.64 (m, 1H), 1.07 (d, J=6.60 Hz, 6H).
Example 1 2-(6-(1H-Indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole methanol Solvate
Method A
Aluminium chloride (2.94 kg, 22 mol) was added to THF (216 kg) and stirred until dissolved. (2-(6-(1H-Indol-4-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)(4-isopropylpiperazin-1-yl)methanone (34.75 kg, 64.5 mol) was added to the vessel washed in with THF (0.5 kg) and the contents cooled to 0° C. A solution of lithium aluminium hydride in THF (10% w/w, 22.6 kg, 59.6 mol) was added maintaining the temperature at less than 20° C., followed by a THF (0.9 kg) line wash. The reaction was stirred for 30 mins and then EtOAc (15.6 kg) added followed by a 1 h stir. A solution of triethanolamine (2.36 kg) in THF (2.1 L) was added followed by triethanolamine (36.8 kg) and then aqueous NaOH (15% w/w, 121 kg). The phases were separated and the organic phase washed with aqueous NaOH (15% w/w, 121 kg), THF (17 kg) added, and the solvent distilled down to 104 L at atmospheric pressure. A constant volume distillation (104 L) was performed by adding MeOH (174 L), and then MeOH (193.3 kg) added. Chlorotrimethylsilane (35.8 kg, 329.5 mol) was added and the reaction heated to 50° C. for 3 h, and then triethylamine (35.8 kg, 353.8 mol) added and the crystallisation cooled to 20° C., filtered off, washed with MeOH (2×55 kg) and dried in the vacuum oven at 50° C. to give the title compound (24.80 kg, 81%).
1H NMR (400 MHz, DMSO-d6) δ ppm 13.43 (br. s., 1H), 11.36 (br. s., 1H), 8.61 (s, 1H), 8.09 (d, J=1.2 Hz, 1H), 7.92 (m, 1H), 7.51-7.46 (m, 2H), 7.32 (s, 1H), 7.28-7.22 (m, 2H), 6.61 (m, 1H), 4.09 (q, J=5.3 Hz, 1H), 3.73 (s, 2H), 3.18 (d, J=4.9 Hz, 3H), 2.60 (br. s., 1H), 2.56-2.40 (m, 4H), 0.94 (d, J=6.4 Hz, 6H).
Method B
Aluminium chloride (4.25 g, 31.8 mmol) was added to THF (250 mL) and stirred until dissolved. (2-(6-(1H-Indol-4-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)oxazol-5-yl)(4-isopropylpiperazin-1-yl)methanone (50 g, 93 mmol) was added to the vessel washed in with THF (100 mL) and the contents cooled to 0-5° C. A solution of lithium aluminium hydride in THF (10% w/w, 35.6 mL, 85 mmol) was added maintaining the temperature at less than 20° C. The reaction was stirred for 105 mins and then EtOAc (25 mL) added followed by a 1 h stir. Triethanolamine (50.5 mL) was added followed aqueous NaOH (15% w/w, 150 mL). The phases were separated and the organic phase washed with aqueous NaOH (15% w/w, 150 mL), and the solvent distilled down to 150 mL at atmospheric pressure. A constant volume distillation (150 mL) was performed by adding MeOH (250 mL). In a separate vessel, chlorotrimethylsilane (59.3 mL, 464 mol) was added cautiously to MeOH (400 mL). The reaction was heated to 50-55° C. and the methanol solution of the substrate was added over approximately 2 h. The reaction was stirred at 55° C. for 3.25 h and then triethylamine (71.2 mL, 511 mmol) added keeping the temperature at less than 60° C. and the crystallisation held for 2 h at 50° C., cooled to 20° C. over 2 h, held at 20° C. for 2 days, filtered off, and washed with MeOH (2×100 mL) and dried in the vacuum oven at 50° C. to give the title compound (35.4 g, 81%).
1H NMR (400 MHz, DMSO-d6) δ ppm 13.43 (br. s., 1H), 11.36 (br. s., 1H), 8.61 (s, 1H), 8.09 (d, J=1.2 Hz, 1H), 7.92 (m, 1H), 7.51-7.46 (m, 2H), 7.32 (s, 1H), 7.28-7.22 (m, 2H), 6.61 (m, 1H), 4.09 (q, J=5.3 Hz, 1H), 3.73 (s, 2H), 3.18 (d, J=4.9 Hz, 3H), 2.60 (br. s., 1H), 2.56-2.40 (m, 4H), 0.94 (d, J=6.4 Hz, 6H).
Example 2 2-(6-(1H-Indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole hemi-succinate
Figure US10266525-20190423-C00071
Method A
2-(6-(1H-Indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole methanol solvate (729.1 g, 1.54 mol) and succinic acid (109.6 g, 0.93 mol) were dissolved in 10% w/w water in DMSO (4.35 L) at 85° C. The solution was filtered into another vessel, the line washed with hot 10% w/w water in DMSO (725 mL) and the solution kept at 85° C. Water (725 mL) was added maintaining the temperature at 85° C., then the contents were cooled to 40° C. over 2 h, and the crystallisation seeded with 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole hemi-succinate (3.63 g) slurried in 25% w/w water in DMSO (54 mL), followed by a line wash of 25% w/w water in DMSO (18.5 mL). The slurry was aged for 30 mins at 40° C. and then water (1.81 L) was added over 1 h, the contents stirred at 40° C. for 1 h, then the crystallisation cooled to 20° C. over 1 h, then aged for 17 h, filtered off, washed with 40% w/w water in DMSO (1.45 L), water (1.45 L), isopropanol (2×1.45 L) and dried under vacuum at 50° C. to give the title compound (626 g, 81%).
1H NMR (400 MHz, DMSO-d6) δ ppm 13.43 (1H, br s), 11.36 (1H, s), 10.00 (br. s, 1H) 8.60 (1H, d, J=0.9 Hz), 8.08 (1H, d, J=1.3 Hz), 7.90-7.92 (1H, m), 7.47-7.50 (1H, m), 7.47 (1H, t, J=2.8 Hz), 7.41 (1H, m), 7.24 (1H, t, J=7.3 Hz), 7.23 (1H, dd, J=7.3, 1.7 Hz), 6.59-6.62 (1H, m), 2.66 (1H, m), 2.40-2.61 (8H, m), 2.38 (2H, s), 1.22 (6H, d, J=6.5 Hz).
Method B
2-(6-(1H-Indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole methanol solvate (10.0 kg, 21.2 mol) and succinic acid (1.50 kg, 12.7 mol) were dissolved in DMSO (50 L) at 85° C. The solution was filtered into another vessel, the line washed with hot DMSO (10 L) and the solution kept at 85° C. Water (17 L) was added maintaining the temperature at 82-88° C., then the contents were cooled to 40° C. at 0.2° C./min, and the crystallisation seeded with 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole hemi-succinate (50 g) slurried in 25% w/w water in DMSO (500 mL), followed by a line wash of 25% w/w water in DMSO (500 mL). The slurry was aged for 30 mins then water (30 L) was added over 8 h, the contents stirred for 1 h, then the crystallisation cooled to 20° C. over 1 h, then aged for 14 h, filtered off, washed with 40% w/w water in DMSO (40 L), water (40 L), isopropanol (3×60 L) as slurry washes and dried under vacuum at 50° C. to give the title compound (7.25 kg, 68%).
1H NMR (400 MHz, DMSO-d6) δ ppm 13.43 (1H, br s), 11.36 (1H, s), 10.00 (br. s, 1H) 8.60 (1H, d, J=0.9 Hz), 8.08 (1H, d, J=1.3 Hz), 7.90-7.92 (1H, m), 7.47-7.50 (1H, m), 7.47 (1H, t, J=2.8 Hz), 7.41 (1H, m), 7.24 (1H, t, J=7.3 Hz), 7.23 (1H, dd, J=7.3, 1.7 Hz), 6.59-6.62 (1H, m), 2.66 (1H, m), 2.40-2.61 (8H, m), 2.38 (2H, s), 1.22 (6H, d, J=6.5 Hz).
Method C
2-(6-(1H-Indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole methanol solvate (629.3 g, 1.33 mol) and succinic acid (94.4 g, 0.80 mol) were dissolved in DMSO (2.83 L) at 85° C. The solution was filtered into another vessel, washing the line with hot DMSO (629 mL) and the solution kept at 85° C. Water (1.132 L) was added maintaining the temperature at 85° C., then the contents were cooled to 70° C. over 1 h, and the crystallisation seeded with 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole hemi-succinate (3.147 g) slurried in 25% v/v water in DMSO (31.5 mL), followed by a line wash of 25% w/w water in DMSO (31.5 mL). The slurry was aged for 120 mins then water (1.573 L) was added over 2.5 h, the contents stirred for 0.5 h, then the crystallisation cooled to 20° C. over 3 h, then aged for 17 h, filtered off, washing with 40% v/v water in DMSO (2.52 L), water (2.52 L), isopropanol (2×2.52 L) and dried under vacuum at 50° C. to give the title compound (501.4 g, 75%).
1H NMR (700 MHz, DMSO-d6) δ ppm 13.43 (1H, br s), 11.36 (1H, s), 10.00 (br. s, 1H) 8.60 (1H, d, J=0.9 Hz), 8.08 (1H, d, J=1.3 Hz), 7.90-7.92 (1H, m), 7.47-7.50 (1H, m), 7.47 (1H, t, J=2.8 Hz), 7.41 (1H, m), 7.24 (1H, t, J=7.3 Hz), 7.23 (1H, dd, J=7.3, 1.7 Hz), 6.59-6.62 (1H, m), 3.75 (2H, s), 2.66 (1H, m), 2.40-2.61 (8H, m), 2.38 (2H, s), 1.22 (6H, d, J=6.5 Hz).
Example 3 2-(6-(1H-Indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole benzoate
Figure US10266525-20190423-C00072
2-(6-(1H-Indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole (28.55 g, 64.8 mmol) and benzoic acid (8.326 g, 68.2 mmol) were dissolved in DMSO (57 mL) and warmed to to 40° C. before adding isopropanol (57 mL). The crystallisation was seeded with 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole benzoate* (183.6 mg) and stirred for 20 mins, isopropanol (114 mL) added, cooled to 20° C. and aged overnight, then filtered off, washed with isopropanol (171 mL) and dried under vacuum at 40° C. to give the title compound (25.95 g, 71%).
1H NMR (400 MHz, DMSO-d6) δ=13.41 (br. s., 1H), 11.36 (br. s., 1H), 8.60 (d, J=0.7 Hz, 1H), 8.08 (d, J=1.0 Hz, 1H), 8.00-7.86 (m, 3H), 7.64-7.57 (m, 1H), 7.52-7.45 (m, 5H), 7.32 (s, 1H), 7.28-7.21 (m, 2H), 6.61 (br. s., 1H), 3.74 (s, 2H), 2.63 (sept, J=6.6 Hz, 1H) 2.55-2.41 (m, 8H), 0.95 (d, J=6.6 Hz, 6H).
X-ray powder diffraction (XRPD) data were acquired on a PANalytical X'Pert Pro powder diffractometer, model PW3040/60 using an X'Celerator detector. The acquisition conditions were: radiation: Cu Kα, generator tension: 40 kV, generator current: 45 mA, start angle: 2.0° 2θ, end angle: 40.0° 2θ, step size: 0.0167° 2θ, time per step: 31.75 seconds. The sample was prepared by mounting a few milligrams of sample on a silicon wafer (zero background plate), resulting in a thin layer of powder.
The XRPD data for a polymorph of 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole benzoate are shown in FIG. 1.
Characteristic XRPD angles and d-spacings for the solid state form are summarised in Table 1. Peak positions were measured using X'Pert Highscore software.
TABLE 1
Diffraction Angles d-spacings
2θ (°) (Å)
6.7 13.2
8.7 10.1
11.2 7.9
11.6 7.6
12.9 6.9
13.3 6.6
16.2 5.5
17.5 5.1
18.7 4.7
19.8 4.5
20.0 4.4
21.0 4.2
22.0 4.0
22.4 4.0
25.6 3.5
*The 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole benzoate seed was obtained in a salt screen which was performed as follows:
1. Dispense 750 μL of solvents into 2-mL HPLC vials containing 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole (~20 mg)
2. Add stoichiometric amount of the acid to the vial
3. Stir the solutions/suspensions while cycling the temperature between 40° C. and 5° C. for 48 hours
4. Isolate crystalline solids by filtration
5. Samples that were solutions or non-crystalline products were subjected to rapid cooling at −20° C., then slow solvent evaporation at RT.
Specifically, the 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole benzoate seed was obtained by adding acetonitrile as solvent to 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole (19 mg) followed by one equivalent of benzoic acid in THF (3M).

Claims (7)

The invention claimed is:
1. A process for preparing a compound of formula (IV) according to Scheme (I):
Scheme (I)
Figure US10266525-20190423-C00073
wherein:
R1 is
Figure US10266525-20190423-C00074
 and
R2 is
Figure US10266525-20190423-C00075
which process comprises the following steps:
(a) reacting a compound of formula (VII):
Figure US10266525-20190423-C00076
or a salt thereof,
wherein:
R1a is
Figure US10266525-20190423-C00077
with a compound of formula (X):
Figure US10266525-20190423-C00078
or a salt thereof,
wherein:
X is halogen; and
P is tetrahydro-2H-pyran-2-yl;
in the presence of a palladium catalyst, to give a compound of formula (XI):
Figure US10266525-20190423-C00079
or a salt thereof,
wherein:
R1a is
Figure US10266525-20190423-C00080
 and
P is tetrahydro-2H-pyran-2-yl;
(b) reacting the compound of formula (XI) above, or a salt thereof, with pinacolborane in the presence of (1,5-cyclooctadiene)(methoxy)iridium (I) dimer, to give a compound of formula (XII):
Figure US10266525-20190423-C00081
or a salt thereof,
wherein:
R1a is
Figure US10266525-20190423-C00082
 and
P is tetrahydro-2H-pyran-2-yl;
(c) reacting the compound of formula (XII) above, or a salt thereof, with a compound of formula (XIV):

R2—X1   (XIV)
or a salt thereof,
wherein:
R2 is
Figure US10266525-20190423-C00083
 and
X1 is halogen;
in the presence of a palladium catalyst, to give a compound of formula (XIII):
Figure US10266525-20190423-C00084
wherein:
R1a is
Figure US10266525-20190423-C00085
R2 is
Figure US10266525-20190423-C00086
 and
P is tetrahydro-2H-pyran-2-yl; and
(d) reacting the compound of formula (XIII) above with a reducing agent selected from the group consisting of sodium borohydride, lithium aluminum hydride, diisobutyl aluminum hydride and sodium bis(2-methoxyethoxy)aluminum hydride, followed by deprotection, to give the compound of formula (IV) above; or
A process for preparing a compound of formula (IV) according to Scheme (II):
Scheme (II)
Figure US10266525-20190423-C00087
wherein:
R1 is
Figure US10266525-20190423-C00088
 and
R2 is
Figure US10266525-20190423-C00089
which process comprises the following steps:
(a) reacting a compound of formula (VII):
Figure US10266525-20190423-C00090
or a salt thereof,
wherein:
R1a is
Figure US10266525-20190423-C00091
with a compound of formula (X):
Figure US10266525-20190423-C00092
or a salt thereof,
wherein:
X is halogen; and
P is tetrahydro-2H-pyran-2-yl;
in the presence of a palladium catalyst, to give a compound of formula (XI):
Figure US10266525-20190423-C00093
or a salt thereof,
wherein:
R1a is
Figure US10266525-20190423-C00094
 and
P is tetrahydro-2H-pyran-2-yl;
(b) reacting the compound of formula (XI) above, or a salt thereof, with pinacolborane in the presence of (1,5-cyclooctadiene)(methoxy)iridium (I) dimer, to give a compound of formula (XII):
Figure US10266525-20190423-C00095
or a salt thereof,
wherein:
R1a is
Figure US10266525-20190423-C00096
 and
P is tetrahydro-2H-pyran-2-yl;
(c) reacting the compound of formula (XII) above, or a salt thereof, with a compound of formula (XIV):

R2—X1   (XIV)
or a salt thereof,
wherein:
R2 is
Figure US10266525-20190423-C00097
 and
X1 is halogen;
in the presence of a palladium catalyst, to give a compound of formula (XIII):
Figure US10266525-20190423-C00098
wherein:
R1a is
Figure US10266525-20190423-C00099
R2 is
Figure US10266525-20190423-C00100
 and
P is tetrahydro-2H-pyran-2-yl; and
(d) reacting the compound of formula (XIII) above with a reducing agent selected from the group consisting of sodium borohydride, lithium aluminum hydride, diisobutyl aluminum hydride and sodium bis(2-methoxyethoxy)aluminum hydride, followed by deprotection, to give the compound of formula (IV) above.
2. The process according to claim 1, wherein:
R1 is
Figure US10266525-20190423-C00101
 and
R2 is
Figure US10266525-20190423-C00102
3. The process according to claim 1, wherein:
R1 is
Figure US10266525-20190423-C00103
 and
R2 is
Figure US10266525-20190423-C00104
4. The process according to claim 1, wherein the reducing agent is lithium aluminium hydride.
5. The process according to claim 1, wherein X is chlorine.
6. The process according to claim 1, wherein X1 is chlorine.
7. The process according to claim 1, wherein deprotection is performed under acidic conditions.
US15/578,258 2015-06-02 2016-05-31 Processes for preparing 2-(6-(1H-indol-4-yl)-1H-indazol-4-yl)-5-((4-isopropylpiperazin-1-yl)methyl)oxazole Active US10266525B2 (en)

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